Giá trị VIF đánh giá hiện tượng đa công tuyến trong phân tích hồi quy
A VIF = 1 indicates no collinearity, whereas increasingly higher values suggest increasing multicollinearity. The approach suggested by Zuur et al. (2010) is to calculate VIFs for each parameter in the model, and if they are larger than some cutoff, sequentially drop the predictor with the largest VIF, recalculate, and repeat until all values